Predicted Signatures at the LHC from U(1) Extensions of the Standard Model

Abstract

We discuss the $U(1{)}_X$ extensions of the standard model with focus on the Stueckelberg mechanism for mass growth for the extra $U(1{)}_X$ gauge boson. The assumption of an axionic connector field which carries dual U(1) quantum numbers, i.e., quantum numbers for the hypercharge $U(1{)}_Y$ and for the hidden sector gauge group $U(1{)}_X$, allows a non-trivial mixing between the mass growth for the neutral gauge vector bosons in the $SU(2{)}_L\times U(1{)}_Y$ sector and the mass growth for the vector boson by the \st mechanism in the $U(1{)}_X$ sector. This results in an extra $Z^{\prime }$ which can be very narrow, but still detectable at the Large Hadron Collider (LHC). The $U(1{)}_X$ extension of the minimal supersymmetric standard model is also considered and the role of the Fayet-Illiopoulos term in such an extension discussed. The $U(1{)}_X$ extensions of the SM and of the MSSM lead to new candidates for dark matter.

16 pages. Based on lectures at the 46th Course at the International School of Subnuclear Physics - Erice -Sicily: 29 August -7 September, 2008

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• The Hunt for New Physics at the Large Hadron Collider
• R-parity Conservation via the Stueckelberg Mechanism: LHC and Dark Matter Signals
• The Physics of New U(1)' Gauge Bosons
• Two-component millicharged dark matter and the EDGES 21cm signal
• Superparticle Signatures: from PAMELA to the LHC